from django.shortcuts import get_object_or_404, render
from django.http import HttpResponse, HttpResponseRedirect
from django.template import loader
from django.http import Http404
from django.urls import reverse
from django.views import generic
from django.db.models import F
from django.utils import timezone

from .models import Question, Choice


# Create your views here.

# # def index(request):
# #     return HttpResponse("Hello, world. You're at the polls index.")

# # def index(request):
# #     latest_question_list = Question.objects.order_by("-pub_date")[:5]
# #     output = ", ".join([q.question_text for q in latest_question_list])
# #     return HttpResponse(output)

# def index(request):
#     latest_question_list = Question.objects.order_by("-pub_date")[:5]
#     context = {
#         "latest_question_list": latest_question_list,
#     }
#     # template = loader.get_template("polls/index.html")
#     # return HttpResponse(template.render(context, request))

#     return render(request, "polls/index.html", context)

# def detail(request, question_id):
#     # return HttpResponse("You're looking at question %s." % question_id)

#     # try:
#     #     question = Question.objects.get(pk=question_id)
#     #     return render(request, "polls/detail.html", {"question": question})
#     # except Question.DoesNotExist:
#     #     raise Http404("Question does not exist")

#     question = get_object_or_404(Question, pk=question_id)
#     return render(request, "polls/detail.html", {"question": question})


# def results(request, question_id):
#     # response = "You're looking at the results of question %s."
#     # return HttpResponse(response % question_id)

#     question = get_object_or_404(Question, pk=question_id)
#     return render(request, "polls/results.html", {"question": question})


class IndexView(generic.ListView):
    template_name = "polls/index.html"
    context_object_name = "latest_question_list"

    def get_queryset(self):
        """Return the last five published questions."""
        # return Question.objects.order_by("-pub_date")[:5]
        return Question.objects.filter(pub_date__lte=timezone.now()).order_by("-pub_date")[:5]


class DetailView(generic.DetailView):
    model = Question
    template_name = "polls/detail.html"
    def get_queryset(self):
        """
        Excludes any questions that aren't published yet.
        """
        return Question.objects.filter(pub_date__lte=timezone.now())




class ResultsView(generic.DetailView):
    model = Question
    template_name = "polls/results.html"


# def vote(request, question_id):
#     return HttpResponse("You're voting on question %s." % question_id)

def vote(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    try:
        selected_choice = question.choice_set.get(pk=request.POST["choice"])
    except (KeyError, Choice.DoesNotExist):
        # Redisplay the question voting form.
        return render(
            request,
            "polls/detail.html",
            {
                "question": question,
                "error_message": "You didn't select a choice.",
            },
        )
    else:
        selected_choice.votes = F("votes") + 1
        selected_choice.save()
        # Always return an HttpResponseRedirect after successfully dealing
        # with POST data. This prevents data from being posted twice if a
        # user hits the Back button.
        return HttpResponseRedirect(reverse("polls:results", args=(question.id,)))
    


from rest_framework import viewsets
from rest_framework.authentication import TokenAuthentication
from rest_framework.permissions import IsAuthenticated
from rest_framework.renderers import JSONRenderer
from .models import User
from .serializers import UserSerializer

from rest_framework.pagination import PageNumberPagination
from rest_framework.filters import SearchFilter

# class UserPagination(PageNumberPagination):
#     page_size = 5
#     page_size_query_param = 'page_size'
#     max_page_size = 100


class UserViewSet(viewsets.ModelViewSet):  # ReadOnlyModelViewSet
    queryset = User.objects.all()
    serializer_class = UserSerializer

    # 身份认证
    # authentication_classes = [TokenAuthentication]
    # 授权配置
    # permission_classes = [IsAuthenticated]

    # 分页配置
    # pagination_class = UserPagination
    
    # 过滤配置
    filter_backends = [SearchFilter]
    search_fields = ['name', 'email'] 

    # 响应格式定制配置，根据请求头中的Accept字段来选择响应格式
    # renderer_classes = [JSONRenderer]




